Honestly? My son is 18 months and still doesn't sleep through the night. And I know he can do it - he's done it on and off since he was 4 months old, mostly off, but usually when he wakes up he's got a good reason. Either he's hungry, or he's teething, or he needs a cuddle. He usually goes back to sleep very quickly, once I've met his need. My first suggestion, in trying to get him to sleep longer - because yeah, that doesn't sound like quite enough sleep to me - is to try moving him onto more solid foods. I'm not saying cut out the nursing, I'm just saying to supplement with more solids than just the cereal. The more solids you get into him, the longer they'll stick in his tummy, the better chance you have of getting him to stay down longer. Look at the protein and carb-rich foods, too - not just fruits, because those don't fill you up for very long. Think veggies, meats, cheeses, yogurts. (Yes, you can feed babies under one year cheese and yogurt!) Snacks are fabulous ways of getting more food in, and as long as you keep them healthy, they're not a bad thing at all. My son eats breakfast at 8am, a snack around 10 or 10.30, lunch around noon or 1, a snack around 3 or 4pm, and dinner around 6 or 6.30. He gets another small snack just before bed at 8pm. He'll usually wake for about 6 ounces of milk sometime during the night. He's had this feeding schedule, more or less, for the last nine months. Good luck!